Your use of Stack Overflow’s Products and Services, including the Stack Overflow Network, is subject to these policies and terms. Note: I´m not using a datasource component in my application (Sql Data Source, Object Data Source, Entity Data Source, etc.). I´m using a Details View but when updating, I cannot get the Old Values because the Details View Update Event Args. No, there are no before properties available in asynchronous events.
When the add-in installs, it creates a document library called IPRTest.
When you use this add-in to change and save the in-place records management settings, the changes are applied to IPRTest.
This is where remote event receivers behave different then server side event receivers.
Solution: use the synchronous event itemupdating, get current item and read it's properties.